Modified Bauxite Residue as an Alternative Supplementary Cementitious Material Pithchai Sivakumar KU Leuven (Belgium)

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Presentation transcript:

Modified Bauxite Residue as an Alternative Supplementary Cementitious Material Pithchai Sivakumar KU Leuven (Belgium)

Current scenario Possible alternative Cement industry = 8 to 10 % of global CO2 emission, 4 to 5 billions tonnes of cement production Alumina industry = 150 to 180 millions tonnes of bauxite residue Possible alternative Can we use bauxite residue in cement industry? Yes! As a SCM after modification Faculty of Engineering Science, Department of Materials Engineering

Experimental procedure 81.5% BR 9.25% SiO2 9.25% B2O3 Thermodynamic calculation 64 wt% liquid 36 wt% hematite 1 h 1200 °C Quenching BR Slag mortar 40% (BR Slag) + 60% (OPC)+ Sand + Water “BR Slag” Faculty of Engineering Science, Department of Materials Engineering

Results and discussion Characterisation of BR slag “BR Slag” Amorphous (Ti, Al) Hematite Component Al2O3 SiO2 B2O3 CaO Fe2O3 TiO2 Na2O wt% 28 26 14 11 8 6 3 Composition of amorphous phase (mass balance) Faculty of Engineering Science, Department of Materials Engineering

Compressive strength Conclusion “BR Slag mortar” Use of B2O3 and SiO2 as fluxing admixtures in a thermal process. BR slag mortar: compressive strength = 66 MPa after 28 d, exceeding the OPC. Process contributes to minimising the volume of disposed BR. Faculty of Engineering Science, Department of Materials Engineering

Thank you...